With Generic Scan Tool

Check Knock Sensors

NOTE:
Contact surfaces between knock sensor and cylinder block must be free of corrosion, dirt and grease.
For the Knock Sensors to function properly, it is important for tightening torque to be exactly 20 Nm.
Use only gold-plated terminals when servicing terminals in harness connector of knock sensors.

Recommended special tools and equipment
- VAG1526 multimeter or VAG1715 multimeter
- VAG1594 connector test kit
- Wiring diagram

Test requirements
- Knock sensor securing bolt tightened to 20 Nm.
- Ignition switched off.

Checking resistances and wires (Vehicles with engine code AEG)






- Disconnect 2-pin connectors from knock sensors.
1 - Knock Sensor (KS) 1 -G61-
2 - Knock Sensor (KS) 2 -G66-

NOTE: Before disconnecting harness connectors, mark allocation to component.






- Measure resistance between terminals 1 + 2 at connectors to knock sensors. Specified value: Infinite Ohms
- Connect test box to control module wiring harness, connect test box for wiring test. Test Box, Connecting For Wiring Test






- Check wires between test box and 2-pin connector to Engine Control Module (ECM) for open circuit according to wiring diagram. Wire resistance: max: 1.5 Ohms






- Also check wires for short circuit to each other. Specified value: Infinite Ohms

If resistances and wires are OK:
- Replace the respective knock sensor:
Knock Sensor (KS) 1 -G61-
Knock Sensor (KS) 2 -G66-

- Erase DTC memory of Engine Control Module (ECM). Clearing Diagnostic Trouble Codes
- Generate readiness code. Monitors, Trips, Drive Cycles and Readiness Codes